Elementary chemical microscopy (1921) Elementary chemical microscopy . elementarychemi00cham Year: 1921 122 ELEMENTARY CHEMICAL MICROSCOPY The Jentzsch Ultracondenser1 can be placed upon the stage of any compound microscope and is so constructed as to combine in itself a reflecting condenser and cell for containing liquids, vapors or gases. It consists, Fig. 60, of a metal cell M, in which are mounted the two reflecting glass bodies G, G'. These are held in place by the cement S, S. Light rays enter the apparatus through the annular opening O, strike the J^ silvered spherical surface in G, ar
Elementary chemical microscopy (1921) Elementary chemical microscopy . elementarychemi00cham Year: 1921 122 ELEMENTARY CHEMICAL MICROSCOPY The Jentzsch Ultracondenser1 can be placed upon the stage of any compound microscope and is so constructed as to combine in itself a reflecting condenser and cell for containing liquids, vapors or gases. It consists, Fig. 60, of a metal cell M, in which are mounted the two reflecting glass bodies G, G'. These are held in place by the cement S, S. Light rays enter the apparatus through the annular opening O, strike the J^ silvered spherical surface in G, are reflected to the curved sides of G' and enter the central cell C. The illuminating rays, therefore, are substantially at right angles to the optic axis of the microscope, thus conforming in general to those in the slit ultramicroscope with, how- ever, this difference, that in the slit instrument the rays enter the cell from one side only, while in the Jentzsch cell the rays enter from all sides and meet at the center. This instrument may therefore be considered as occupying an intermediate position between the slit ultramicroscope and the cardioid type of ultramicroscope. A cover N fits into the mounting M and is secured in place by a bayonet catch. By turning the cover slightly it is made to press down upon the rubber gasket RR, making a very tight seal against the upper surface of G\ The tubes TT serve for the passage of gas or of liquid through the cell. The cover N is provided with a well-like depression closed at the end by the quartz plate Q. This well permits an objective of long working distance to be focused upon the particles in suspension at the focal point of the illuminating rays. When in use the ultracondenser is laid upon the stage of the microscope with the short tube A inserted into the stage opening. 1 Made by Ernst Leitz, Wetzlar: and C. Baker, London. Fig. 60. The Jentzsch Ultracon- denser.
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